Since kernel 3.7 my internal GSM modem interfaces name has changed from usb0 to wwan0 ,indeed it sounds good :) . However, it messed up Knemo traffic statistic, since I registered my internet connection based on its volume. So it’s better to use the same ifname. Using udev, I force my Slackware to use wwan0 as ifname.
root@pcxthinkslack:~# cat /etc/udev/rules.d/10-network.rules
SUBSYSTEM=="net", ATTR{address}=="02:80:37:ec:02:00", NAME="wwan0"=-=-=-=-=
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